I've submitted a patch for this to Bell Labs repo:

/n/sources/patch/tcp-halfduplex-close

Please review it; the change is fairly small.

It would be great if others could try it out. I've done light testing with
rc.  I've also verified it passes Go's net/http/serve_test.go (see
https://github.com/golang/go/issues/17906). All testing has been done with
RPI's (1's and 3's). I plan to do more testing with x86 box. Please try it
if you can.

Thanks everyone for your help,
-Skip

On Sun, Feb 5, 2017 at 1:48 PM Charles Forsyth <charles.forsyth@gmail.com>
wrote:

> On 5 February 2017 at 18:13, Bakul Shah <bakul@bitblocks.com> wrote:
>
> If they implement close correctly, they should be able to implement
> close-read correctly, it being a pure subset. In theory :-)
>
>
> but they didn't, so it's useless.
>
>
> As for SYN+data+FIN you had to have both sides properly implement rfc1644
> or the T/TCP extension.
>
>
> the original tcp/ip spec allowed for it, if implemented carefully (partly
> because of its heritage), but again, mismatch of implementations rendered
> it useless.
>
>
> This extension was deprecated at least by 2004 due to "the ease of DoS
> attacks that can result".
>
>
> yes, that's exactly what meant there was no longer any point in trying.
>
>
>